fix: add us-cpa tax year rules and package metadata

docs/us-cpa.md

@@ -2,6 +2,21 @@
 
 `us-cpa` is a Python CLI plus OpenClaw skill wrapper for U.S. federal individual tax work.
 
+## Standalone package usage
+
+From `skills/us-cpa/`:
+
+```bash
+pip install -e .[dev]
+us-cpa --help
+```
+
+Without installing, the repo-local wrapper works directly:
+
+```bash
+skills/us-cpa/scripts/us-cpa --help
+```
+
 ## Current Milestone
 
 Current implementation now includes:
@@ -13,10 +28,9 @@ Current implementation now includes:
 - case-folder intake and conflict-stop handling
 - question workflow with conversation and memo output
 - prepare workflow for the current supported 1040 subset
+- review workflow with findings-first output
 - e-file-ready draft export payload generation
 
-Review logic and broader form coverage are still pending.
-
 ## CLI Surface
 
 ```bash